Manufacture of incandescing electric lamps



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v I W.HO`LZER. '-MANUPACTUBE- of INGANDESCING ELECTRIC LAMPS. No. 298,879. A Patented-Feb.19,1884. y

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W. HOLZBR MANUFAGTURE QF INGANDBSOING ELECTRIC LAMPS.- l v No. 293,879-f Patented Peb. 19, 1884.*

ATTEST= ESO UNITED STATES- PATENT OEEICE.

WILLIAM HOLZER, OF HARRISON, NEW JERSEY.

MANUFACTURE oF INCANDEsclNG ELECTRIC LAMPS.

SPECIFICATION forming part of l Letters Patent N o. 293,879, dated February 19, 1884.

Applicationlcd June 7, 1883. (Ne model.) I

To all whom it may concer/1,

Be it known that I, WILLIAM HoLzEE, of Harrison, in the county of Hudson and State of N ew Jersey, have invented anew and useful Improvement in the Manufacture 4of Incandescing Electric Lamps, of which the following is a specification.

In manufacturing the glass stem or wire support of an incandescing electric lamp the leading-in wires are laid in a glass tube, and the end thereof is softened by heat and then pressed down upon the wires. `It isnecessary that this solidified portion of the glass should be cooled off gradually to anneal the glass, as a sudden cooling would render the glass liable to fracture. Myinvention relates to a method and apparatus for accomplishing this gradual cooling of these parts. To this end I provide a series of stationary gas or other burners, graduated to produce different temperatures decreasing from the rst to the last ofthe series. The glass stem is inverted above these burners and passed overthem one after another, lower degrees of heat being thus successively applied and the glass being gradually cooled and annealed.

The preferable form of myinventionis illustrated in the annexed drawings.

Figure I is an elevation of the cage which incloses the apparatus; Fig. 2, an elevation,

with a portion of the cage broken away; Fig;

3, a top view of the revolving portion which supports the glass stems, and Fig. 4 a top View of the gas-pipe and burners. L

'A is a suitable cage, having a sliding door, B, permitting access to its interior. Through the bottom of the cage passes a gas-pipe, a, to which is connected a circular pipe, b, supported from the bottom of the cage, and 'extending around the bottom, as shown. From this pipe extend the series of gas-burners@ c, of gradually-diminishing intensity. A 4stationary stem, d, rises from the center of the bottom of the cage and supports the sleeve e, which turns upon the stem. This sleeve supports by spokes f the rings g g, from each of which project a number of pairs of spring- Iingers,h h. The tubes i, having the wires sealed in them, are held by these spring-fingers, as shown.

When a tube is first placed in the apparatus, it is placed over the llame of greatest heat. After a time the sleeve and rings are revolved and the tube placed over the next flame, another tube being placed in position after the first o'ne. After a tube has passed over all the burners, remaining for a short time over ing put in and started on the circuit as soon as one which has completed the circuit is re- Inoved.

I do not claim herein, broadly, the use of a series of stationary burners with lamp-holders traveling above them, whereby a gradual diminution of heat in the lamp is effected, since this is claimed in my application No. 97,337.

What I claim isl. The combination, with a ring of stationary burners of graduated relative intensity, of a circular frame revolving above the burners for supporting one or more incandescentlamp stems, substantially as set forth.

2. The circular gas-pipe, provided with a series of gas-burners, but With a portion of its length unprovided with burners, substantially as and for the purpose set forth.

8. The combination ofthe stationary series of burners, the stationary stem, the revolving frame provided with spring-ngers, and the stop for limiting the revolution of the frame,

substantially as set forth.

4. The Icombination of the inclosing-cagc, the stationary ring of burners, and the revolving frame for carrying `the lamp-stems, substantially as set forth. Y f y This specification signed' and witnessed this 17th day of May, 1883.

VILLIAM HOLZER. Witnesses: .A

H. W. SEELY, W, J. Lawns. 

